Terme di Petriolo

Terme di Petriolo is a thermal spa set in the Basso Merse natural reserve in the municipality of Monticiano, in the province of Siena, Tuscany. Its waters rise from a spring on the bank of the Farma stream, and the site states the springs have been known since Roman and Etruscan times.

Thermal water

The spring supplies hyperthermal water at a temperature above 43°C. The water feeds therapeutic thermal pools and is used with ozonized hydromassage. The venue does not state the water's mineral composition.

Treatments and therapies

The spa presents a range of treatments grounded in its thermal water. Balneotherapy (thermal bathing) is offered to help treat various chronic conditions of the body. Mud therapy, applied at 47°C, is described as having anti-inflammatory, analgesic and muscle-relaxing effects. Inhalation and aerosol therapies target respiratory conditions with anti-inflammatory, decongestant and mucolytic action. The venue also provides massage, including treatment suited to localized muscle pain, along with bio-oil full-body massage and wellness body treatments. According to the site, the thermal baths, mud treatments and inhalation therapies are provided under agreement with the Italian National Health Service (SSN).

Setting and amenities

The spa sits within a natural reserve of woods and hills. On site the Bistrot di Petriolo serves Tuscan cuisine, including appetizers and dinner. The Locanda di Petriolo is offered as partner accommodation under a convention agreement.

Opening hours

The spa states hours of Monday to Sunday, 09:00 to 18:00. The site also notes a seasonal closure from 4 July to 31 August 2026, with reopening on 1 September 2026.